14-Bit, 500 kSPS,
PulSAR ADC in MSOP and LFCSP
Data Sheet
AD7946
FEATURES
TYPICAL APPLICATION CIRCUIT
0.5V TO 5V
5V
14-bit resolution with no missing codes
Throughput: 500 kSPS
INL: 0.4 LSB typical, 1 LSB maximum ( 0.0061% of FSR)
SINAD: 85 dB at 20 kHz
THD: −100 dB at 20 kHz
Pseudo differential analog input range
0 V to REF with REF up to VDD
No pipeline delay
VIO
SDI
1.8V TO VDD
REF VDD
0V TO REF
IN+
IN–
SCK
SDO
CNV
AD7946
3- OR 4-WIRE INTERFACE
(SPI, DAISY CHAIN, CS)
GND
Single-supply 5 V operation with 1.8 V/2.5 V/3 V/5 V logic
interface
Proprietary serial interface
Figure 1.
GENERAL DESCRIPTION
The AD79461 is a 14-bit, charge redistribution, successive
approximation, analog-to-digital converter (ADC) that operates
from a single 5 V power supply, VDD. It contains a low power,
high speed, 14-bit sampling ADC with no missing codes, an
internal conversion clock, and a versatile serial interface port.
The part also contains a low noise, wide bandwidth, short
aperture delay track-and-hold circuit. On the CNV rising edge,
it samples an analog input IN+ between 0 V to REF with respect
to a ground sense IN−. The reference voltage, REF, is applied
externally and can be set up to the supply voltage.
SPI-/QSPI™-/MICROWIRE™-/DSP-compatible
Daisy-chain multiple ADCs and BUSY indicator
Power dissipation
3.3 mW at 5 V/100 kSPS
3.3 µW at 5 V/100 SPS
Standby current: 1 nA
10-lead MSOP (MSOP-8 size) and
3 mm × 3 mm LFCSP (SOT-23 size)
Pin-for-pin compatible with the 16-bit AD7686
APPLICATIONS
Its power scales linearly with throughput.
Battery-powered equipment
Data acquisition
Instrumentation
Medical instruments
Process control
The SPI-compatible serial interface also features the ability,
using the SDI input, to daisy-chain several ADCs on a single,
3-wire bus, or it provides an optional BUSY indicator. It is
compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate
supply VIO.
The AD7946 is housed in a 10-lead MSOP or a 10-lead LFCSP
with operation specified from −40°C to +85°C.
1 Protected by U.S. Patent 6,703,961.
Table 1. MSOP, LFCSP 14-/16-/18-Bit PulSAR® ADC
Type
14-Bit
16-Bit
100 kSPS
AD7940
AD7680
AD7683
AD7684
250 kSPS
AD79421
AD76851
AD76871
AD7694
400 kSPS to 500 kSPS
AD79461
≥1000 kSPS
ADC Driver
AD76861
AD79801
AD79831
ADA4941
ADA4841
AD76881
AD76931
18-Bit
AD76911
AD76901
AD79821
AD79841
ADA4941
ADA4841
1 Pin-for-pin compatible.
Rev. B
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